join us for lunch on the second floor. but things are c-span audience for being with us. [applause] we think are speakers are great as well. [applause] >> every weekend on booktv, 48 hours of nonfiction books are featured on the weekend. over the next four hours, biographies of president obama in the first lady. and they look at the genealogy of michele obama. then david maraniss in his book on barack obama. later, the white house videographer for the first two years of the obama presidency. >> you don't always find many in any area embracing investigative reporting. it's not just economics. if the discomfort that it often causes. because it is troublesome. it is more than economics if you are going to ruffle the feathers of someone powerful. that gives those people running into complaints of the publisher. we were very fortunate through the 70s and almost all of our prayers. let the chips fall where they may. >> donald bartlett and james steele will take your calls and e-mails and tweets next month on internet. they began their collaborative work in the 70s and are the c